Install homebrew if not already there
Add md5sha1sum
Different method for checking if brew pkg is installed

Should be faster. Also, seems like `brew ls $pkg` doesn't exit with
non-zero code if $pkg doesn't exist anymore.
Add wget
Save prefix, significantly speed up package checks
Install/use brew bash instead of system bash
Run OSX defaults script on start
Add a log message so we know wth is going on
Automagically install casks, too
Link alfred to brew-cask
Add a bunch more casks